I found out the lab I now use has new machinery and new reference ranges. Serum TSH and serum ft4 will be plasma samples. TSH used to be 0.40-4 and ft4 10-25. Next time 0.5-4.5 and 10.2-21.
So next time I cannot compare results and see how they have changed as numbers , I should compare the % compared to given range in the past and now?